Publication Date


Document Type


First Advisor

Bow, Sing-Tze, 1924-

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Electrical Engineering


Image processing--Digital techniques; Springs (Mechanism)


The goal of this research work is to design an efficient algorithm for the automatic structure analysis of the spring. The general procedure used in solving problems with the digital image processing technique. Namely: (1) Image preprocessing, (2) Image segmentation, (3) Image analysis, and (4) Image interpretation, are first reviewed, and then applied to the problem. Work reported in this thesis was mainly focused on the development of the algorithms specifically for the automatic analysis of a spring structure. The algorithms developed to solve the problems include: (1) Thresholding, (2) Contour tracing, (3) Locating the vertices and valleys of the contour, (4) Eliminating the wriggles on the contour, and (5) Calibrating the system with various zoom settings. Experiments were conducted. A large number of springs have been used as samples for the repeatability test to evaluate the effectiveness of the algorithm. Results show that the algorithm suggested is very efficient and successful. Repeatability of the algorithm is very good. The processing time is short. Although the work reported in this thesis is mainly for the off-line spring structure verification, the results obtained so far show that the approach can be extended to, and seem to be a very good start toward, the on-line spring structure verification processing.


Includes bibliographical references (pages 58-59)


vii, 93 pages




Northern Illinois University

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